It is not right ____ in public places.
—We can use QQ to talk with each other online.—Really? Could you show me ______it?
—What is your best friend like?.—He is a helpful student. He often helps the teachers _____ papers.
We ____ the last bus and didn’t have any money for taxi, so we had to walk home.
He is listening _____, but he can ____ hear anything.
—Do you know the boy ____ is playing soccer there?—Certainly, he is a friend of my _____